Sung Min Kwon

Chung-Ang University

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Sung Kyu Park

Chung-Ang University

Yong‐Hoon Kim

Sungkyunkwan University

Myung‐Gil Kim

Sungkyunkwan University

Sung Woon Cho

Sunchon National University

Jong Beom

Korea Advanced Institute of Science and Technology

Chanho Jo

Chung-Ang University

Jaehyun Kim

Chung-Ang University

Jae Sang Heo

Sungkyunkwan University

Jee Young Kwak

Chung-Ang University

Seung Soo Yoon

Sungkyunkwan University

Cooperative Institutions

Chung-Ang University

Sungkyunkwan University

Korea Advanced Institute of Science and Technology

Seoul National University

Samsung (South Korea)

Yonsei University

Government of the Republic of Korea

Daegu Gyeongbuk Institute of Science and Technology

Pohang University of Science and Technology

Korea University

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Multi-spectral gate-triggered heterogeneous photonic neuro-transistors for power-efficient brain-inspired neuromorphic computing

Nano Energy (2019)

Sung Woon Cho Sung Min Kwon Minkyung Lee Jeong‐Wan Jo Jae Sang Heo

Neuromorphic engineering

10.1016/j.nanoen.2019.104097

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Citations (52)

Fast Surface and Volume Rendering Based on Shear-Warp Factorization for a Surgical Simulator

Computer Aided Surgery (2002)

Keun Ho Kim Il Keun Kwon Sung Min Kwon Jong Beom Hyun Wook Park

Fast simultaneous visualization of 3D medical images and medical instruments is necessary for a surgical simulator. Because unconstrained motion of a medical instrument is more frequent than that of the patient, the visualization of medical instruments is performed in real time using surface rendering. However, volume rendering is usually used for realistic visualization of the 3D medical image. We have developed an algorithm to combine a volume-rendered image and a surface-rendered image using a Z-buffer for depth cueing, which is applied to a surgical simulator. Surface rendering is used for visualization of a medical instrument, whereas 3D medical images such as CT and MRI are usually visualized by volume rendering, because segmentation of the medical image is difficult. In this study, when the volume-rendered image is combined with the surface-rendered image, the amount of computation is reduced by early ray termination and instrument-region masking in the sheared image space. Using these methods, a fast combination of volume-rendered and surface-rendered images is performed with high image quality. The method is appropriate for real-time visualization of 3D medical images and medical instrument motion in the images, and can be applied to image-guided therapy and surgical simulators.

3D rendering

10.3109/10929080209146035

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Citations (7)

Highly adaptive and energy efficient neuromorphic computation enabled by deep-spike heterostructure photonic neuro-transistors

Nano Energy (2022)

Sung Soo Cho Jaehyun Kim Sungwoo Jeong Sung Min Kwon Chanho Jo

Neuromorphic engineering

10.1016/j.nanoen.2022.107991

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Citations (9)

Enhanced Optoelectronic Properties of Solution-Processed Metal-Chalcogenide Devices Via Hydrogen-Driven Post-Annealing

SSRN Electronic Journal (2022)

Seung‐Ji Nam Jee Young Kwak Sung Min Kwon Dong‐Won Kang Jong‐Min Lee

Here, we report a general strategy to obtain low-temperature processed high-quality and large-area metal chalcogenide (CdSe) semiconductors from precursor based benign solution process. Using hydrogen-driven post thermal annealing, the deposited thin films enable expeditious formation at relatively low process temperature (< 350˚C), which are easily transformed into the corresponding high-quality and large-area films with less defect states and more crystalline structures, indicating enhanced electro-optical properties. The improved metal chalcogenide alloy thin-films are successfully synthesized and the versatility of this facile route is demonstrated by fabricating large-area thin-film-transistors and optoelectronic devices on 4-inch silicon and 2.5-inch borosilicate glass substrates in air ambient. The polycrystalline hydrogenated CdSe-based thin-film-transistor (TFT) exhibited relatively good electro-optical properties such as a maximum field-effect mobility larger than 150 cm 2 V -1 s -1 with on/off current ratio of > 10 7 and subthreshold slope of <1 V decade -1 as well as improved responsivity (9.64×10 -3 AW -1 ) and switching speed. To validate our findings, we discussed the detailed mechanism of the reduction of defect states and precisely designed thin film synthesis with process temperature, time, the correlation with molecular composition, physical structure of the films, and the optoelectronic performance of CdSe TFTs.

10.2139/ssrn.4118360

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P‐33: High‐Mobility CdSe Thin‐Film Transistors and Circuits by Sol‐gel Method

SID Symposium Digest of Technical Papers (2017)

Sung Min Kwon Myung Gil Kim Su Min Jung Sung Kyu Park

We exploit large‐area and high‐performance solution‐processed CdSe thin‐film transistors (TFTs) and 7‐stage ring oscillators. A CdSe thin‐film was successfully demonstrated using relative low temperature (<400 °C) sol‐gel processing via organoselenide and cadmium precursors. A CdSe thin‐film from commercial organic solvent process was used for active layer of thin‐film transistors and integrated circuits which demonstrate electron saturation mobilities exceeding 152 cm 2 /V‐s and frequency of 1 MHz in 7‐stage ring oscillators on borosilicate glass substrates.

Borosilicate glass

Saturation (graph theory)

10.1002/sdtp.11894

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Citations (1)

Red Fluorescent 4-(Dicyanomethylene)-2- (1-pentylbicyclo[2,2,2]oct-4-yl)-6-(1,1,2,2,7,7-hexamethyljulolidyl-9-enyl)-4H-pyran (DCHMJPB) for Organic Light-Emitting Diodes (OLEDs)

Molecular Crystals and Liquid Crystals (2012)

Sung Min Kwon Kum Hee Lee Young Kwan Kim Seung Soo Yoon

An efficient red fluorescent compound, 4-(Dicyanomethylene)-2-(1-pentylbicyclo- [2,2,2]oct-4-yl)-6-(1,1,2,2,7,7-hexamethyljulolidyl-9-enyl)-4H-pyran (DCHMJPB) containing two additional methyl groups on julolidine moiety and 1-pentylbicyclo- [2,2,2]octyl group on pyran moiety, was synthesized and characterized. In this red emitter, the bulky groups such as two additional methyl groups and 1-pentylbicyclo- [2,2,2]octyl group were introduced to increase the steric hindrance between the red emitters and prevent concentration quenching. In particular, in an efficient red device containing emitter DCHMJPB as a dopant, a luminous and power efficiency of 3.76 cd/A and 1.97 lm/W was achieved, respectively, at 20 mA/cm2 with the CIE coordinates of (x = 0.56, y = 0.42) at 7.0V.

Moiety

Pyran

Backlight

10.1080/15421406.2012.703810

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Citations (0)

A skin-like two-dimensionally pixelized full-color quantum dot photodetector

Science Advances (2019)

Jaehyun Kim Sung Min Kwon Yeo Kyung Kang Yong‐Hoon Kim Myoung‐Jae Lee

We report a skin-like full-band on-chip photodetector enabled by two-dimensionally pixelized chalcometallate ligand quantum dots.

Photodiode

Photoresistor

10.1126/sciadv.aax8801

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Citations (128)

Efficient Oxygen‐Vacancy Suppression and Electrical Stabilization of Solution‐Processed In₂O₃:Q (Q = S, Se) Thin‐Film Transistor with Chalcogen Alloying

Advanced Electronic Materials (2022)

Paul Lee Minh Nhut Le Gahye Kim Sung Min Kwon Jeong‐Wan Jo

Abstract Transparent oxide semiconductors are successfully implemented as thin‐film transistors (TFTs) for large‐area display applications with superior electrical performance in comparison with that of conventional amorphous silicon. However, further development of high‐performance oxide semiconductors is hindered by the trade‐off between mobility and stability. Mixed metal composition containing heavy metal cations shows high‐mobility/low‐stability and light metal cations exhibits low‐mobility/high‐stability. A novel material design strategy for realizing a high‐performance oxide semiconductor for TFTs through partial substitution of Se or S for O in In 2 O 3 is reported. In contrast to the conventional small‐sized Ga substitution for suppressing oxygen vacancies, the replacement of O by Se or S results in lattice stabilization and oxygen‐vacancy suppression, consequently stabilizing Se‐ or S‐incorporated In 2 O 3 TFTs. In 2 O 3 :Se TFTs exhibit an average field‐effect mobility of 6.1 cm 2 V −1 s −1 , ON/OFF current ratio ( I on / I off ) of 10 8 , and excellent operational stability with threshold voltage shift values of < 0.10 V at a positive and negative bias stress for 10 000 s. Furthermore, the seven‐stage ring oscillator circuit operating at a supply bias of 20 V exhibits an oscillation frequency of > 805 kHz and a corresponding propagation delay of <90 ns per stage.

Chalcogen

10.1002/aelm.202101250

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Citations (8)

The Effect of Multimedia Presentation Method on the Children's Developmental Language and Thinking Abilities

Journal of Children’s Media & Education (2010)

Sung Min Kwon

Presentation (obstetrics)

Source

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Citations (1)

Realistic force reflection in a spine biopsy simulator

Dong‐Soo Kwon Ki‐Uk Kyung Sung Min Kwon Jong Beom Hyun Wook Park

This paper proposes a scheme to produce realistic force reflection in a needle insertion problem. The target system is a spine needle biopsy simulator for tumor inspection by needle insertion. Simulated force is calculated using a 3D human tissue model and the orientation and position of the needle, and is produced through the PHANToM/sup TM/ device. To generate realistic force reflection, the directional force of the needle has been generated by a related tissue model, and the rotational force is generated using a pivot to keep the needle in the initial inserted direction after puncturing the skin. Since the haptic device has limitations in generating high stiffness and large damping, a scale-down model and digital filter are used to stabilize the system.

Reflection

10.1109/robot.2001.932799

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Citations (32)